DKM-409 Pro AT User Manual Rev_02 Firmware V-2.5
The unit features waveform display together with a precision harmonic analyzer for both voltages and
currents. Both phase to neutral and phase to phase voltages are available for analysis.
Scopemeter Display
The waveform display memory is of 100 samples length and 12 bit resolution, with a sampling rate of
2048 s/s. Thus one cycle of a a 50Hz signal is represented with 41 points. The vertical scale is
automatically adjusted in order to avoid clipping of the signal.
The waveform is displayed on the device screen, and with more resolution on PC screen through the
RainbowPlus program.
The display memory is also available in the Modbus register area for third party applications. For more
details please check chapter “
MODBUS Communications
”.
The harmonic analyzer consists on a Fast Fourier Transform (FFT) algorithm which is run twice a second
on the selected parameter.
The sample memory is 1024 samples length and 12 bits resolution with a sampling rate of 8196 s/s.
The unit is able to analyze up to 2500Hz and up to 49th harmonic, whichever is smaller.
Harmonics Display Screens
All harmonics are displayed with 0.1% resolution.
On RainbowPlus program, harmonics and waveform are displayed with more resolution.
RainbowPlus Scada section: Waveform Display and Harmonics
10. WAVEFORM DISPLAY & HARMONIC ANALYSIS
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